3/8" NPT Thread Specifications
Complete dimensions for 3/8" NPT pipe thread. TPI: 18, Pitch: 0.05556" (1.411 mm).
Thread Dimensions
| Designation | 3/8" NPT |
| Nominal Pipe Size | 3/8" |
| TPI | 18 |
| Pitch | 0.05556" (1.411 mm) |
| Outside Diameter | 0.675" (17.14 mm) |
| Pitch Diameter | 0.6389" (16.23 mm) |
| Minor Diameter | 0.6068" (15.41 mm) |
| Taper Angle | 1.7899° (1:16 taper ratio) |
| Thread Depth | 0.03849" (0.978 mm) |
Tap Drill Size
Tap drill: 0.6068" (15.41 mm)
Common Applications
- Plumbing connections
- Gas piping
- Hydraulic fittings
- Pneumatic connections